header{
    width: 100%;
    line-height: 2;
    div{
        background-color: #ffc107;
        padding: 10px 10px;
        position: fixed;
        top: 0;
        z-index: 1;
        span{
            margin: 0 auto;
            color: #fff;
        }
    }
}

main{
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: fixed;
    .iconfont{
        font-size: 30px;
        color: #888;
    }
    p{
        margin-top: 10px;
        font-style: 20px;
        color: #888;
    }
}